<!DOCTYPE html>
<html>

<head>
    <!-- 基线位置测试 -->
    <meta charset="utf-8">
    <title>基线位置测试</title>
    <style>
        .box {
            border: 1px solid #f99;


            line-height: 250px;
            background-color: antiquewhite;

            font-size: 250px;
            font-family: 'Segoe Print';
        }

        .base-line{
            width: 100%;
            height: 0px;
            border-bottom: 1px dashed #146c77;
            display: inline-block;
        }

        .letter{
            background-color: slategray;
            color: antiquewhite;
        }
    </style>
</head>

<body>
    <div class="box">
            <div class="base-line"></div>
    </div>

</body>

</html>